B0481

DTC B0481

DTC DESCRIPTORS

DTC B0481 00
Overheat Detected, Software Level

DTC B0482 00
Overheat Detected, Hardware Level

DTC B0483 00
Overheat Possible

DIAGNOSTIC FAULT INFORMATION






IMPORTANT: Always perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Initial Inspection and Diagnostic Overview

CIRCUIT/SYSTEM DESCRIPTION
The fuel operated heater uses a coolant heater overheat sensor to protect the unit for over temperature conditions. The fuel operated heater also uses Overheat Detection software.

CONDITIONS FOR RUNNING THE DTC
Engine running

CONDITIONS FOR SETTING THE DTC
Fuel operated heater has recognized out of range condition for more than 2.5 seconds.

ACTION TAKEN WHEN THE DTC SETS
Fuel operated heater is disabled.

CONDITIONS FOR CLEARING THE DTC
DTC must be cleared with a scan tool.

CIRCUIT/SYSTEM VERIFICATION
Start the vehicle. Observe the coolant heater over heat sensor scan tool parameter. The scan tool parameter should display between 0.09-4.9 volts.

COMPONENT TESTING
1. Ignition OFF, disconnect the 14-pin coolant heater module connector from the module.
2. Test the coolant heater over heat sensor resistance.
3. Compare the readings with the Temperature vs Resistance table and verify that the resistance is within 5 percent of the specification.
- If the resistance vs temperature reading is not within 5 percent, replace the coolant heater overheat sensor.
4. If the coolant heater overheat sensor tests normal, replace the coolant heater.

REPAIR INSTRUCTIONS

IMPORTANT: Always perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Cell link coolant heater overheat sensor

Cell link replace the coolant heater